Materials Literature
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Abstract The transamidation reaction in a polyamic acid solution has been investigated using size‐exclusion chromatography and low‐angle light scattering. Mixtures of a high‐molecular weight ( DP = 150) and a low‐molecular weight ( DP = 10) polymer and of the high‐molecular weight polymer with monomer were studied. Mi…
Abstract The plasticization by 4‐decylaniline (4DA) of a microphase‐separated poly(ethyl acrylate) ionomer containing sodium carboxylate groups is examined. Dynamic mechanical thermal analysis, supplemented by differential scanning calorimetry, shows that the matrix and cluster glass transitions ( T g 's) in the ionom…
Abstract 10‐(Pentamethyl disiloxanyl) decyl oxazoline ( Si ) was synthesized. It was copolymerized with either undecyl ( U ) or nonyl ( N ) oxazolines using methyl 4‐nitrobenzenesulfonate as initiator. Two series of random poly( N ‐acylethylenimine) copolymers, U/Si and N/Si , were synthesized over the whole compositi…
Abstract Dried gels of a linear low‐density polyethylene cast from decalin solutions are investigated with particular attention toward structural, thermal, and mechanical properties. The number‐average and weight‐average molecular weights are M n = 32,000 and M w = 160,000. In the concentration range 1.00–0.20, the sw…
Neutron spectroscopy has been applied to study the electronic ground state of NpO 2 both in the paramagnetic and in the ordered phase, below T c =25 K. The magnetic inelastic scattering cross section shows a broad peak which is split into two components and is centred at about 55 meV. This inelastic peak is shown to o…
Aluminum tantalum nitride amorphous alloy powders have been synthesized by a high energy ball mill under purified nitrogen gas (N2) flow at room temperature. The alloy powders were characterized by means of transmission electron microscopy, differential thermal analysis, and chemical analysis. An amorphous phase conta…
Recent experiments in charge-density-wave systems suggest that thermally activated phase slip is responsible for current flow. We present a quantitative theory that explains the nonlinear current-voltage relationship.
The fundamental surface chemistry underlying selectivity in copper chemical vapor deposition (CVD) from COD-Cu-hfac and Cu(hfac)2 has been determined. Both electronic and chemistry contributions strongly influence the precursor reactivity on oxide as compared to metal surfaces. These results have important implication…
Abstract The dielectric relaxation of 30% crystalline Nylon‐12 of molecular weight 20,000 has been studied at frequencies from 12 Hz to 0.1 MHz and temperatures from 77 to 375 K, and the effect of water on the relaxation spectra has been investigated. Absorbed water increases both the rate and the intensity of both it…
Abstract Wide‐angle x‐ray scattering (WAXS) and Raman spectroscopic data show that on both the crystal and molecular levels, a bimodal stress distribution exists in strained high‐performance polyethylene fibers. In part of the crystalline PE the microscopic strain level is high (ca. 70% of macroscopic strain); in the…
The formation of photoluminescent porous Si in an etchant solution made from the HF-HNO3-CH3COOH system is reported. The porous Si is characterized on the basis of its photoluminescence (PL) spectra and the degradation of the PL during exposure to laser irradiation. The surface topography as characterized by atomic fo…
An investigation was carried out on both the linear and nonlinear parts of the complex dielectric susceptibility in the frequency and temperature ranges 10 -3 -10 3 Hz and 100-450 K, respectively. The analysis of the imaginary part of the dielectric susceptibility has revealed the existence of a broad spectrum of rela…
Chemical-vapor-deposited (CVD) polycrystalline diamond films have recently been reported with a thermal conductivity that is only 25% less than that of high quality single-crystal natural diamond. By studying a series of such films of various thicknesses grown under virtually identical conditions, we have discovered a…
Abstract The absorption spectra of thin film of polyaniline (PANI) on slide glass coated by a spin coater were measured as a function of the protonation state of PANI, the concentration of solution of PANI in NMP, drying temperature, and atmosphere. The absorbance value of the 950 nm peak and the ratio of the absorban…
Abstract The thermolysis under argon of various polysiloxane resins containing D, T, D H , or T H units was investigated using thermogravimetric analysis combined with mass spectroscopy (TG/MS analysis) and solid‐state 29 Si‐NMR. Redistribution reactions involving the exchange of SiC/SiO bonds or SiH/SiO bonds wer…
Molecular-dynamics simulations are used to show that strongly interacting dipolar spheres can form a ferroelectric nematic phase. This is the first demonstration that dipolar forces alone can create an orientationally ordered liquid state. It is also the first time that the existence of a ferroelectric nematic phase h…
Electron energy-loss near-edge structures at the oxygen K edges of a number of titanium(IV)-oxygen compounds have been measured with an energy resolution of 0.5 eV. A detailed interpretation of the observed structures in terms of the differing nearest-neighbour coordinations of oxygen is obtained by comparing the expe…
Emphasizes actual structural design, not analysis, of multistory buildings for seismic resistance. Strong emphasis is placed on specific detailing requirements for construction. Fundamental design principles are presented to create buildings that respond to a wide range of potential seismic forces, which are illustrat…
This book, together with its companion volume The Science of Crystallization: Microscopic Interfacial Phenomena, make up a complete course that will teach an advanced student how to understand and analyse scientifically any of the phenomena that are observed during natural or technological crystallization from any med…
Abstract The influence of a number of factors (temperature–speed regime and the quantity of draw stages, molecular weight of a polymer, etc.) on the deformability of initial isotropic IPP and on mechanical characteristics of highly‐oriented samples, obtained in the process of a two‐stages isothermal orientation drawin…